Bryan,
In Austria we use following test to check the fueltanks:
Fill the wings completly with water. Seal all openings. Add a tube to the fuel pickup.
This tube should be 1.43 meters high and will also be filled with water. Keep this for a few hours
and check the water level.
1,43m of water = 0,14bar = 4,14inHG Pressure
There is no barometric error.
Christian
Lnc2 / 390
OE-VCM